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AJvYcCW4d1xyvPgQpbBL4O3EXM1p1VXRGJJIINrCeBkMRrvcqp7eGxldfeL4ocCtdN42QUrwqnHbjfmahQ/C2T4=@vger.kernel.org X-Gm-Message-State: AOJu0YxNvnByZEcDXLTr3rrE/Ra17lnAo69HCbZ7sZkJlYhlFan3wvTx 5dkYuCYllwk51L4/oxlcxJfHdR6qviatjMs6ay4rQOL6tFwgqa81IGBsi6Nyjz/ClLEItr73r0o zfm0Mmnqn70lInOwJ0O2EAPTvxgW2prKdBd3BYlQXNAyrQyRBf7QJoHg= X-Google-Smtp-Source: AGHT+IEiDKBfFWE1MqSel+pRkRJk2QXs0IOi7u6ba5rSr/O09dIhHCbhqBg1AwFcDstzuaSaD/Ftueu4cw9ePU1UNchptEdD84BJ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:17c8:b0:3a0:4c4e:2e53 with SMTP id e9e14a558f8ab-3a37597a1e5mr82022995ab.5.1728256826711; Sun, 06 Oct 2024 16:20:26 -0700 (PDT) Date: Sun, 06 Oct 2024 16:20:26 -0700 In-Reply-To: <000000000000dbc80e061b01a34f@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67031b3a.050a0220.49194.04e9.GAE@google.com> Subject: Re: [syzbot] [net?] [nfc?] KMSAN: uninit-value in nci_ntf_packet (3) From: syzbot To: davem@davemloft.net, edumazet@google.com, krzk@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 8f602276d390 Merge tag 'bcachefs-2024-10-05' of git://evil.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=148c27d0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d302f14701986aa0 dashboard link: https://syzkaller.appspot.com/bug?extid=3f8fa0edaa75710cd66e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1367f307980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c98327980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/241996bfa3de/disk-8f602276.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/417de1b4ca32/vmlinux-8f602276.xz kernel image: https://storage.googleapis.com/syzbot-assets/2c793c19b953/bzImage-8f602276.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3f8fa0edaa75710cd66e@syzkaller.appspotmail.com nci: nci_rf_discover_ntf_packet: unsupported rf_tech_and_mode 0xe6 ===================================================== BUG: KMSAN: uninit-value in nci_rf_discover_ntf_packet net/nfc/nci/ntf.c:386 [inline] BUG: KMSAN: uninit-value in nci_ntf_packet+0x2ac6/0x39c0 net/nfc/nci/ntf.c:798 nci_rf_discover_ntf_packet net/nfc/nci/ntf.c:386 [inline] nci_ntf_packet+0x2ac6/0x39c0 net/nfc/nci/ntf.c:798 nci_rx_work+0x408/0x6f0 net/nfc/nci/core.c:1544 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: slab_post_alloc_hook mm/slub.c:4091 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4186 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] virtual_ncidev_write+0x67/0x380 drivers/nfc/virtual_ncidev.c:120 vfs_write+0x487/0x1540 fs/read_write.c:681 ksys_write+0x24f/0x4c0 fs/read_write.c:736 __do_sys_write fs/read_write.c:748 [inline] __se_sys_write fs/read_write.c:745 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:745 x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 2937 Comm: kworker/u8:9 Not tainted 6.12.0-rc1-syzkaller-00349-g8f602276d390 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: nfc2_nci_rx_wq nci_rx_work ===================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.